Originally Posted by WSJ

Under the FAA plan, seven major airports will require daily ground-delay programs affecting about 3,800 flights, according to the memo. Those airports, some of the busiest or most congested in the country, include Newark Liberty International, John F. Kennedy International and La Guardia in New York, Chicago's O'Hare International, and Los Angeles International, the memo said.
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Six other big airports "likely" will require daily traffic management initiatives affecting about 2,900 daily flights, the FAA told the airlines, according to the memo. Those airports include Atlanta, Philadelphia, Miami and San Francisco. Traffic management generally means slowing the flow of traffic so air-traffic controllers don't get overwhelmed.
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The staffing furloughs will result in capacity reductions of varying degrees, the memo said. For instance, the rate of arriving planes at Newark will drop to 38 per hour from 48, a 21% reduction. O'Hare's arrival rate will drop to 72 planes per hour from 112, a 36% reduction. Los Angeles arrivals will decline to 48 an hour from 80, a 40% cut.